Multitubular steam-boiler.



No. 673,494. Patented May 7, 1901."

P. w. BURKE.

MULTITUBU LAR STEAM BOILER.

(Application filed Jan. 10, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

PERCY W. BURKE, o F'oHIoAco, ILLINOIS.

-MULTITUBULAR STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 673,494, dated May' '7,1901.

Application filed January 10, 1901. Serial No. 42,771. (No model.)

To all whom it may concern.-

Be it known that I, PERCY W. BURKE, a citizen of the United States,residing at Ohicago, in the county of Cook and'State of Illi-" nois,have invented certain new and useful Improvements in MultitubularSteam-Boilers; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to multitubular circulation steam-boilers adaptedmore particularly for domestic heating purposes.

The object of my invention is to provide a simplified construction of amultitubular boiler in which all of the available heatingspace. iseffectively utilized and the side walls of the fire-box and ash-pitprotected by coils of pipe through which water is circulated between alower mud-drum and an upper steamdrum. Y

My.water-circulating pipes are connected at opposite ends by simplevertical returnbends, forming single vertical coils or serpentines,filling all of .the space from the level of the ash-pit floor back ofthe bridge-wall and above the fire-box to their connections with thesteam-drum below the water-line therein. The steam-drum at the top ofthefurnace and the mud-drum in the ash-pit below the grate are alsoconnected at'each end by a vertical pipe or column, the two pipes beingof sufficient capacity to supply all of the coils and serving tocomplete the circuit of water circulation.

The matter constituting my invention herein will be set forth in theclaims. I

I will now describe the details of construction of my improvedmultitubular boiler by reference to the accompanying drawings, in whichFigure 1 represents front elevation withpart of the front wall of thefurnace broken away for showing the return-bend ends of thecirculating-coils. Fig; 2 represents a vertical longitudinal section.

The upper drum A, serving as the steamdrum, is preferably settransversely at the top and front of the furnace-shell C,resting partlyon the flange c ,of the front wall and partly on the side walls of thefurnace, and is provided with the steam-outlet pipe a and at one endwith a water-gage at.

The drum B, serving as the mud-drum, is located at the bottom of theash-pit and preferably at the front of the furnace, as shown in Fig. 2.A blow-0E pipe I), having a valve 19, is connected with each end of drumB and near the bottom for blowing off sedimentary matter.

The furnace-shell C may be of brick or iron and is provided in frontwith the usual doors 0 0, opening, respectively, into the fire-box H andash-pit K, and at the rear with aelean-out door 0.

The coil or serpentine sections D connect the steam-drum A with themud-drum B and ,fill all of the available space above the firewith drumA below the water-line, as shown- The coils are made in single ver-' inFig. 2. tical sections composed of horizontal pipes connected atopposite ends by the malleableiron return-bends d, which are verticallydisposed, as shown. Adjacent to the side walls of the furnace and oneach side of the firebox and ash-pit is placed a coil or serpentine toreceive the heat and protect the walls. Back of the bridge-wall G eachsection of coil is continued with short lengths of pipe, connecting byreturn-bends (1 adjacent to bridge-wall and by theother return-bends dat the rear of the furnace to the level of the ash-pit floor and finallyconnects by a pipe extending through the bottom of the'ash-pit to themud-drum B.

It will therefore be un-' derstood that the floor of the ash-pit iscovered with single pipes of the coil-sections connecting wit-h the drumB. The connections will be made in a manner well known to pipe and steamfitters. The bridge-wall G is made high, as shown, to direct the flameand hot products well upinto contact with the coilsections D, and uponit and the front wall is supportedthe rocking. grate, of any wellknownpattern. To the grate is connected a lever-handle h. A removableash-panmay be set upon the pipes below the grate. A feed-water pipe Econnects with drum B. The steam -drum A and mud-drum B are alsoconnected at their ends by the two vertical columns F F, which will beof sufficient capacity to conduct thewater delivered by the IOO' in drumB, from which they may be blown ofi when necessary. The smoke-pipe L isconnected at the bottom of the rear wall, so that the flame and hotproducts after passing over the bridge-wall are compelled to pass bydownraft in contact with the coil-section back of the bridge-wall downto the ash-pit-floor level, as indicated in Fig. 2. The most economicaland satisfactory results in heating the coils are thus efiected.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is'- 1. The combination with the steam-drum atthe top of the furnace and the mud-drum below the grate, of circulationcoils or serpentines constructed of horizontal pipes andvertically-disposed return-bends, forming single vertical sections ofcoils, filling the space above the fire-box and back of the lateralpipes or columns connecting the up per and lower drums at the front ofthe furnace to complete the circuit of water circulation, substantiallyas described.

2. The combination with the steam-drum at the top of the furnace and themud-drum below the grate, of sections of circulation coils orserpentines constructed of horizontal pipes and vertically-disposedreturn-bends, a vertical serpentine section being placed on each side ofthe fire-box and ash-pit to receive the heat and protect the side wallsof the furnace, and the remaining sections filling the space above thefire-box and back of the bridge-wall, from the level of the ash-pitfloor to their connections with the steamdruni, below the water-linetherein, and vertical pipes or columns conneotin g the ends of the upperand lower drums at the front of the furnace to complete the circuit ofwater circulation, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

' PERCY W. BURKE. Witnesses:

J. F. HEPNER, L. J. MYERS.

